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Species Globoturborotalita gnaucki Blow & Banner 1962


Diagnosis / Definition:
Pearson et al. (2006):
DESCRIPTION. Type of wall: Cancellate, normal perforate, spinose, ruber-type wall structure. Test morphology: Test moderately low trochospiral, globular, lobulate in outline, chambers globular; in spiral view 4112 globular, slightly embracing chambers in ultimate whorl, increasing moderately in size, sutures depressed, straight; in umbilical view 4% globular, slightly embracing chambers, increasing moderately in size, sutures depressed, straight, umbilicus large, open, enclosed by surrounding chambers, aperture umbilical, a rounded arch, bordered by a thin thickened rim; in edge view chambers globular in shape, slightly embracing, initial spire of chambers slightly elevated. Size: Maximum diameter 0.25-0.36 mm, minimum diameter 0.23-30 mm, maximum width 0.19 mm.
Discussion / Comments:
Pearson et al. (2006):
DISTINGUISHING FEATURES.- The species is characterized by its small lobulate test, slightly embracing, globular chambers, large umbilical aperture, and cancellate wall texture. DISCUSSION.- The holotype of Globoturborotalita gnaucki is illustrated in SEM for the first time (Pl. 6.4: Figs. 1-4). Blow (1979) considered Globigerina gnaucki as a possible junior synonmy of Globigerina fariasi BerrnudCz, but that species has 5 to 6 chambers in the ultimate whorl and a very large open umbilicus. Globoturborotalita gnaucki is a distinctive form in the upper Eocene and lower Oligocene and is here elevated to species level. We include a paratype of Globigerina ouachitaensis Howe and Wallace, illustrated in SEM for the first time (PI. 6.4: Fig. 15) in this species. The species originated during the late Eocene radiation of Globotuvborotalita. We place Howe and Wallace's (1932) paratype of Globigerina ouachitaensis in synonymy. PHYLOGENETIC RELATIONSHIPS.- Globoturborotalita gnaucki was derived from Globoturborotalita ouachitaensis by an increase in the number of chambers in the ultimate whorl to 4 1/2. GEOGRAPHIC DISTRIBUTION .- Distributed in mid- to low latitudes. STABLE ISOTOPE PALEOBIOL0GY.- No data available.
Systematics:

35
 Ordo Foraminiferida
  Superfamilia Globigerinaceae
   Familia Globigerinidae
    Genus Globoturborotalita
     Species Globoturborotalita gnaucki
Synonym list:
Pearson et al. (2006):
p 1932 Globigerina ouachitaensis Howe & Wallace. - Howe & Wallace : (paratype, not holotype) [Zone E15116, Danville Landing, Louisana]. [Not Howe and Wallace, 1932.]
1962 Globigerina ouachitaensis gnaucki Blow & Banner. - Blow & Banner : p.91 pl. IX: fig. 1-n, holotype [lower Oligocene Globigerina oligocaenica Zone, Sample FCRM 1965, Lindi area, Tanzania]
1969 Globigerina ouachitaensis gnaucki Blow & Banner. - Blow : p.320 pl. 2; fig. 1-3 (holotype reillustrated)
1980 Globigerina ouachitaensis Howe & Wallace. - Charollais et al. : p.64 pl. 6; fig. 14-17 [lower Oligocene, France].[Not Howe and Wallace, 1932.]
1985 Globigerina ouachitaensis gnaucki Blow & Banner. - Bolli & Saunders : p.182 fig. 13: 16a-c (holotype reillustrated)
2006 Globoturborotalita gnaucki Blow & Banner. - Pearson et al. : p.124 pl. 6.4; fig. 1-15 (Pl. 6.4, Figs. 1-3: new SEMs of holotype of Globigerina ouachitaensis gaaucki Blow and Banner)
Specimen:
Natural History Museum, London, Inventory number: P44509
References:

Howe,H.V. and Wallace,W.E. (1932):
Foraminifera of the Jackson Eocene at Danville Landing on the Ouachita, Catahoula Parish, Louisiana . Bull. Louisiana Dept. Conservation Geol. Vol. 2 p. 18-79

Blow,W.H. and Banner,F.T. (1962):
The Mid-Tertiary (Upper Eocene to Aquitanian) Globigerinaceae.
In: Fundamentals of Mid‑Tertiary Stratigraphical Correlation Eds: Eames, F.E.Banner, F.T.Blow, W.H.Clarke, W.J. p. 61‑151

Blow,W.H. (1969):
Late middle Eocene to Recent planktonic foraminiferal biostratigraphy.
In: Proceedings of the First International Conference on Planktonic Microfossils, Geneva 1967 Vol. 1 Eds: Bronnimann, P.Renz, H.H. p. 199-422

Charollais,J..; Hochuli,P..; Oektlt,H..; Perch-Nielsen,K.; Toumarkine,M.; Rögl,F. and Pajris,-.J.. (1980):
Les Marnes Foraminiféres et les Schistes a Meletta des Chaines Subalpines septentrionales (Haute-Savoie, France) . Eclogae Geologicae Helvetiae Vol. 73 p. 9-69

Bolli,H.M. and Saunders,J.B. (1985):
Oligocene to Holocene low latitude planktic foraminifers.
In: Plankton Stratigraphy Eds: Bolli, H.M.Saunders, J.B. p. 155-262

Pearson,P.N.; Olsson,R.K.; Hemleben,C.; Huber,B.T. and Berggren,W.A. (2006):
Atlas of Eocene Planktonic Foraminifera. p. 1-513
Anonymous: Unedited TaxonConcept data
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